Suppression of psi(2S) production in p-Pb collisions at root sNN=5.02 TeV

Abelev B., Adam J., Adamova D., Aggarwal M. M., Agnello M., Agostinelli A., ...More

JOURNAL OF HIGH ENERGY PHYSICS, vol.2014, no.12, pp.1-25, 2014 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 2014 Issue: 12
  • Publication Date: 2014
  • Doi Number: 10.1007/jhep12(2014)073
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1-25
  • Keywords: Charm physics, Heavy Ions, PSI' PRODUCTION, J/PSI, CHARMONIUM
  • Bursa Uludag University Affiliated: No


The ALICE Collaboration has studied the inclusive production of the charmonium state psi(2S) in proton-lead (p-Pb) collisions at the nucleon-nucleon centre of mass energy root sNN=5.02TeV at the CERN LHC. The measurement was performed at forward(2.03 < y(cms) < 3.53) and backward (-4.46 < y(cms) < -2.96) centre of mass rapidities, studying the decays into muon pairs. In this paper, we present the inclusive production cross sections sigma(psi(2S)), both integrated and as a function of the transverse momentum pT, for the two y(cms) domains. The results are compared to those obtained for the 1S vector state (J/psi), by showing the ratios between the production cross sections, as well as the double ratios [sigma(psi(2S))/sigma(J/psi)]pPb/[sigma(&(2S))/sigma(J/&PSI)]pp between p-Pb and proton-proton collisions. Finally, the nuclear modification factor for inclusive psi(2S) is evaluated and compared to the measurement of the same quantity for J/psi and to theoretical models including parton shadowing and coherent energy loss mechanisms. The results show a significantly larger suppression of the psi(2S) compared to that measured for J/psi and to models. These observations represent a clear indication for sizeable final state effects on psi(2S) production.